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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c4b3c614a3740ef5d8a9b8d92d8f55b2cdcc62608e5283bf37d8f4f426cd51c' 
  AND token = 'ZjiqZEX5Dj9Vsc5u4nCunsugIHchbUx21NJoNIqiTvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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