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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '447d157546ffc41151af0b81ff0f47de8c05b1e0674c5b61bc88779adc86554c' 
  AND token = 'of631B5D7wUgFGz8aOdQM00d4DwVCpMXTi3zdy3msJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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