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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2740766579620575c6c9fc6c2e6ef8383c941de17284bd7e202da19b3ab3465' 
  AND token = 'rCX6aJXZbv476wcWjQE4oMTu5dQVOP1181Pa+EqNxUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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