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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca03aa1dcac783e4eb9898d671c478103a3b629f7c73c3ad292cf7ef9d365a77' 
  AND token = 'U4lWvvbSrtfxrlYQq7VUr4PT0CTGH0F1ChUnxrg75gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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