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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fc0b8057635a17038c3f493c924d2d23446ad88ed660a76b39d40cd72afd17a' 
  AND token = 'IgWAFMap06EaO93DSKt9oXho7dqKYzoNGPzgE6n8VDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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