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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '856ffe81533443360a02f61d5480c95eabf4bf2f3c0f5aa7b956fc2cf4026125' 
  AND token = 'c4g6zZzbakEWKvoMeJ0koBHQdaXkkZiFzWeBOMCleO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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