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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1822b4f803fd18997d0c1e3a7770815464f8fe0ae8153ad7692d3c18e6ba884' 
  AND token = 'Q04Sh9duQ+lGbjIQxc2/kf8hxcHAE3vf3Y/Z+4P4sZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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