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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98d1237e06f6442d3b440fed9d2fc74034de24aff53b19ca9988bc45721f18ba' 
  AND token = 'HbRD3AG152Yy3Wytnu79dUGGRwbTI/SAr4nTOHGRyds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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