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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '827770b55d89d9f5ee6a1c6e85c731630a8685cc9e5ab55a654a537e63758b33' 
  AND token = 'Vl01DbkvFFOYqVxyQrr/JuFHtcxWAsTZ80ghIHXGVWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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