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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5844a5f0e5696e2b73036693c8238fbb134a9b0afebf36ab3d525252cc65b43' 
  AND token = '8tc4WUOPMHzerIzuLltuKttZ28KN3w5jYd3x44kPosU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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