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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd40fcea80668c1a80680a7cf030ff888d80942ef501e9ae15b4ec5f58732f039' 
  AND token = 'WWb6CfYHaQgkUnoXe2TG9ZrtZGA0mc8smP7YKdH1Lsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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