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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50ec3c752802666fcb490af3bca40912390b64237a094ae02c5c7b804ca68af4' 
  AND token = 'd5QwXLfz96k/SFCa5F1eNLUxCcr9ilMEVQZT5fTQxEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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