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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88e3d33d39cdc5cafa46bc017a7ec1c54bf7d1d0e2cf4bf6f26f9b755f1a9304' 
  AND token = 'KOIL+2XEiINV+IU+ScHbH30QKb/ackSjd5c6AUSIkxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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