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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dce1b6e10eda338a44075cabb02c6ab407df8d5d4a1a427be4deca27e8d34d16' 
  AND token = 'uj4oLfep5Vln7kusF4zcvRovRRqgIxvnKjZ/SIwyVzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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