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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59a1c75efa5875817324e772d9f30aefb7a175d7c9ceedae3289a12cd7314610' 
  AND token = 'tInQVjwvh0RKD70L/zgFN679n3Jcz2Ht3rvqsf4BNI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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