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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24f06c8758c7d758990c2f30d026b3722eafa9d837ab3a66ff3cf6eefbafc59f' 
  AND token = 't5Q6XZZp1KQYBXMkZBl3P6XCO6NYrJQFPrwD7DtaMR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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