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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f941a35abd0fe7f97547516fdd60a15815c2179650e859b2a0e829e03a1f96a1' 
  AND token = 'ayZ8sJ1El70+o0Y6FPpvDONbe9jnYjq6ZQTG5J8C5cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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