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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c656c0a6fef18596e5aa7c5b35dc2ce9503f47ce8a9be5bb12acb6754c20f34' 
  AND token = 'r30e0yCxVpGBqsJ+CI4wQYJ9H1g6lja7/V3tcXsUfsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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