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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b71fee7c4c0e6211cb8a0bf3f995a7697e7d7c83fc6886c108458c784b914b1e' 
  AND token = 'B+SwcX7jR+8AzJoZKib+Ssg9ajpaV9VghiIqnODfr9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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