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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3394f84e70fd58214adbaefdd496f69b86416c3c9c2651e75bad38997616562f' 
  AND token = '+HLC2YeTC+eQlUF+9dzJvsUlBJefcSw3Tp+fz4BlZts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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