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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00f3518eb3de53c6881ec3502a2acce1aafd5f6411367360e67daf7dfe40fb2e' 
  AND token = 'uA7BZqTLIgrS96jR+w4t9GPI1CxpSQeilJO5T4nieOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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