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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d9ccea58d4a4c6c8b6c62ebfebbb19452ad3e08c574c4373df60c5311b164f9' 
  AND token = '+Odgs8TfdILWqmZHLihTSxCpaSiYGA10uyToelzMfFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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