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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1030f2e4ec3a3edbaf7537e81c6e6f39b397511c1df7423ca1f0aacc4651d116' 
  AND token = '/m5+IfE1Epf2mZQckmRxI8GfNNbvI/cCPeCP5w+IvA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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