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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78515851b824a488f81e455c565738680831590b056306a29e7d22c140513bd1' 
  AND token = 'qjXKI7Sw24OfZDoi3L5xraI+G80lagGYyPsm1nH/+b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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