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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea352cc3c0e5b6188e13a59dc1ac00447bc4ee17aacaf16e01a6863929046635' 
  AND token = 'C5sYqyekZc63iMVpfmtQbPICiuAD7N+UbhY4ml7IXhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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