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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd66540d7c2b85b94460da4e05a182b70a65cd15ac439770a6a0f005e67a53241' 
  AND token = 'aRIYmeguaaA5kOyTWvD1m8szR+kcG8YNR5qG+5sw8dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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