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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07ad57e9e93be2b428b5950ff38e5f448b6c14c20580ebcd0b5a31983dbd4bcf' 
  AND token = '2SP3AYzLSf1UTga/2ZTZesTJ1h71waPeAyVmalfyc44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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