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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7f57651e851bf41920f4c00f840e384bc10ad367aa60996a787bcd797d62308' 
  AND token = 'nsiQnMUSHteMJLL+dMn12MOPZKzxu/9WDhR9HT8X67Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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