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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a58a1d0e14ce4323c30ad41f93e9f031379171b879780375050c22a794687d6' 
  AND token = 'g5CpdQ0gSysxFPgEKxe6ErxxVTqWfAUfyNeiYZ89Qw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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