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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b74ac693e989bf1d6f858e8fa5b2a3c196180672c4ac1515fa985f4d9162146f' 
  AND token = '7Lc0nCycu8WZEmTlu2B3CZ+6p8prpyeeHwULMd2DwNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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