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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c8e85e852b56643d94f454a2080af71641e4cae32dc4b5760dc8bba05499283' 
  AND token = 'sjUePGuq1MCgq22KdjcbevFVFSQ6E1sO/JlzQycPf6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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