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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c02afa71b89ad6ced2a61aad1907725380a10d65389792a0761ec407a56fa26b' 
  AND token = 'nPhwgb5uWoFryk2soM32Fl4IwvrjdIbEeESyMZRgh/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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