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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '522295493946aa3cd794c9bfbb7267263597a4f2288b17f2c41960ce287e4a0e' 
  AND token = 'EHnUdpCOCJ00WkjSNXsbR5z6LbDZSczkOZO+QeiQNNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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