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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71dcefb9403c4ec3897f26d40f6d5a254c8990a806df5d2b423b94e8f8ad7fbb' 
  AND token = 'r3//R2TT0RZRevEmg2ZsFdkrQBISV1fIRKklc9qfxwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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