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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ae10e9175e34199ba229ee709068d14b43e83b9ceb1dc92845ebc16d675b75' 
  AND token = 'RM7QOxYKd5AA8FH5SHjHJ3bm29JC0ao52AYgqTP3R+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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