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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfa8696e7301b70171811dba76323dc5ad2d3b28b2053d14e39dcce0aeb5942a' 
  AND token = 'z1UR2cmxt3C5vmFc9JFwLbfGc2SDIDXT7DZvn57hjAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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