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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b330cf61e592c1aaa5eea2d8ab1d0fe3e44956feb137c8dd4a4e5f65fb60469' 
  AND token = 'JGBSQ8BMGTNEyHO2r88cJ+IHSJNTqK0a1hsSanDmDIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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