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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1abbf3fcebecb38aeb5f0f0a68c8375b306ded4bc85918e03c8a0d064a3f1f3' 
  AND token = 'gH56+36JkhQ7aFL8s14KjO03ibQpm2JHq/rtmTpVD8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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