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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16240b3cb7143a812bc775b8c83c292f01c26ab7f0c340713757d59cc3c8278f' 
  AND token = 'kRC5reEosAIcL5KUbIMMzfoQgAm8+ESToP4b7agksrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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