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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04cd5ce149b881b136d7f817bfd87efba3c57bebdd8d1d6ea322cbf6575b4742' 
  AND token = '0gDiLgcmfrtJuucZr05tyryjCLIAlJSpe3X5rCnPXis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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