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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c4824aa1cb2e1cad3863083483862f20578fb8435dd7c321f6481a34164f8f' 
  AND token = 'oHiABEqIdtM9/Q6JgBbj4DdKhKOXeIt/h93rZZFrT1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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