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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '803cf10accf68bfc1a121e33f2aeb1e6f2880b5d96f67b5a7422d2e9fc9060aa' 
  AND token = 'hA8RIPe9dgWCu996ZHIIxTp1toATjlJXC48Huc2Lj1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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