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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b014ac0be58dd89fa5a30f1f5fc5a9374c4f72f374293a21aad27611f7c8ee8' 
  AND token = '3i9/CAbrn6JfRBTLIl5bQa9xJ7YqlMnuqKhYpgiP0i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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