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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e63bdcf8d384d0fa9d8c3109086d408bf44a9a0d60407772d4c73d9f2fc4eb92' 
  AND token = 'qGAFK9HY6xAG9xuK0a8x8wx4k7jDwwqYnm4BeJyYXeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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