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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69fbe74039278d2b4e72a04bed74c3d46f7b1dcba163f5dc93680fdcdea49e51' 
  AND token = '6t8TWcOR9VMPMGS80y/Mq1HTPwKPCax36/5MFrzhl98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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