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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ba5511f4c800324e4ba34ffc8157ca7686021eca167e5f3edbdbfd7010506ed' 
  AND token = 'n3zjvc/4ATByv7BCTdIgfTq7rb83+eZ2CfdYNB1Ghq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}