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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f2c7a33156e7802d5c340df8c3c81e23524ab03b7dc4d616207d083fc81c9d2' 
  AND token = '7F+w8SNG6hymdUgLQRZ4GcesXQWSBf2lsXT0LThVD2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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