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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a156b3c733045aa19066ce7e67b088cbdf6e826ca3cf49e2880bfab8775ef20' 
  AND token = '5kFrnKg60o4bXE9agqmzIO/EQv8ZbVDN8gn9zrP3s14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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