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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb400738791836e35802d422276afe5955c0fd847f87c051510a88e9cb15c227' 
  AND token = 'w9fbFA1bzjbgLgqEWcoW7J4pASKi2ZmIDCVz1VkA2vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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