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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd405d47b3be002f2294488c3182b028dc7dec3af40a7e0afd99823a55af4fb2c' 
  AND token = '58HpVZOUBf695HLhCHNm0klDN/OpDx4Jq3mBt5L9Ax4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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