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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cf922083627d805fc6212e7d90f334b25f2eb437f8687890d25a3124d2eead9' 
  AND token = 'e7I6Hezhg/ctp2wNrqbeTjHFh9O4oQyZqdDD7k4RCW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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