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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cc1895e62fefb56cb4dbc51518c84d532281cd94b0d4888e2a0b62852bccec6' 
  AND token = 'lCz+kj+/dVNhv6oc/08NElpBUCZtqayu4NE3sw9xw70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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