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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f29e03c374ff94e040a8da7f819153814618e24f0d2e2315e82c505daa72e7b' 
  AND token = 'N6TIXTMhgZe6Dd3a99RBzLdlzg2/8MOGdsLlABddtPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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