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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '043dcd1cc8fb8f19d86b1e346dde1f8fc17ba82fca6f2e4e06969f9aba6038c3' 
  AND token = 'AZqJRLiqddvAWtOSUgdAGLmgI9uM0areLGE//LfcTGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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