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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a415261f4ab60d9b58d1017936e0044e4faecf0637518eba9d8a2bc2c95ba68' 
  AND token = 'z+7E2U0NudS7+9IanaMptPVhaCMRtyB6QRiQjL3kFvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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